Jolt to convert json array into single element - jolt

Question

Shown below are 2 records in the JSON document ( i will have more than 2 ) :
[{
"abc": [{
"value": 44.636914,
"testName": "1 Month",
"date": "2020-02-14"
},
{
"value": -0.117243,
"testName": "1 Week",
"date": "2020-01-21"
}],
"currency": "CAD",
"date2": "2020-01-14",
"id": "W38450"
}
{
"abc": [{
"value": -0.873175,
"testName": "1 Month",
"date": "2020-02-14"
},
{
"value": 0.005599,
"testName": "1 Week",
"date": "2020-01-21"
},
{
"value": 0.001231,
"testName": "11 Week",
"date": "2020-02-21"
}],
"currency": "CAD",
"date2": "2020-01-14",
"id": "W38209"
}]
i would like to use jolt to convert the array in "abc" as a single value
desired output:
[{
"abc": "[{'value': 44.636914,'testName': '1 Month','date': '2020-02-14'},{'value': -0.117243,'testName': '1 Week','date': '2020-01-21'}]",
"currency": "CAD",
"date2": "2020-01-14",
"id": "W38450"
}
{
"abc": "[{'value': -0.873175,'testName': '1 Month','date': '2020-02-14'},{'value': 0.005599,'testName': '1 Week','date': '2020-01-21'},{'value': 0.001231,'testName': '11 Week','date': '2020-02-21'}]",
"currency": "CAD",
"date2": "2020-01-14",
"id": "W38209"
}]
Note that the array size of "abc" is not constant and i think it is necessarily to change double quote (") to single quote (') as well.
please advice a solution using Jolt.

Answer 1

Here is sample of stucture. Now what left to do is to combine with concat function.
[
{
"operation": "shift",
"spec": {
"*": {
"abc": {
"*": {
"*": {
"$": "[&4].toConcat[&2]",
"#": "[&4].toConcat[&2]"
}
}
},
"currency": "[&1].currency",
"date2": "[&1].date2",
"id": "[&1].id"
}
}
},
{
"operation": "modify-default-beta",
"spec": {
"*": {
"abc": "=join(',',#(1,toConcat))"
}
}
}
]